Just days after Hayden was born, her mother knew something wasn't right with her newborn.

She was having constant spasms.

Doctors at Phoenix Children's Hospital discovered the left side of her brain was too big and keeping the right side from functioning properly.

So, they disconnected the left side of her brain completely.

"We're hoping because we did this at a young age that a lot of the normal hemisphere will take over that function and really start to move her forward," Dr. David Adelson, chief of neurosurgery at PCH, said.

Poeling said her daughter hasn't had a seizure since the surgery and she seems to be thriving.